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I don't mean backup one to the other, but mirror data and authorisation so the second can be used immediatly if neccesary. (Should be built-in to the system using rsync.) I understand I can't use MS DFS despite the NASes are in the domain. What about running rsync under CygWin on the domain server?

At this time, our products do not support System Network Fail-Over; however we are considering this for development for a future generation of Synology product. At this time, there is currently no set date, so information is not guaranteed at the moment.

Thank you for your fast respons Franklin.That means I haven't missed anything.I would be content with having a ready spare, not necessarily a fully automated failover setup.Then I could just change the DNS to point to the spare if needed, with no need for a restore.

With regards to having a spare on hand, what you could do is simply use network backup to conduct your backups. When you need to bring the "secondary" system only, you will need to perform the following

1) Restore the user configurations2) Move all data from the "NetBackup" folder to their individual root folders

With regards to rsync under Cygwin, this article may help, but it may not.

In theory, yes, you could manually configure both RS408s to mirror each other with that link you provided, however it would involve a lot of programming, debugging, testing, and understanding of the Synology system.

So, while scientifically, it is possible, however in a practical sense, it's not possible. It is best to either

A) Wait until if or when we support System Network Fail-overB) Consider to use the "spare" NAS as described previousllyB1) Though we are considering to make this "spare" behavior a bit easier (with more automation), it's still under discussion by our development team.

Thank you for the third time Franklin!I agree with your view on this matter, it will take too much time and efford to get it to work.

I'll have to put them to use in a sligthly different way that I planned to.Anyway, keep up the good work and hopefully you will put in to the system a possibility for mirroring and fail-over sometime in the future.